Skip to main content Accessibility help
×
Home

The Effect of Surface Roughness on the Extinction Spectra and Electromagnetic Fields around Gold Nanoparticles

  • Shuzhou Li (a1) and George C. Schatz (a2)

Abstract

Electromagnetic enhancement arising from plasmon resonance excitation plays a major role in surface-enhanced Raman spectroscopy (SERS), and as a result nanoparticle morphology can significantly affect SERS intensities. In this paper we have calculated these enhancements as well as extinction spectra using the discrete dipole approximation for a system consisting of a dimer of gold disks that is made using on-wire lithography. Including surface roughness in the calculations leads to SERS enhancements for the disks whose dependence on disk spacing and thickness is in agreement with experimental measurements, with a maximum enhancement when the thickness of the disk and the disk-disk gap are 100 nm and 32 nm, respectively. These results are in better agreement with experiments than earlier estimates based on flat surfaces.

Copyright

References

Hide All
1. Moskovits, M., in Surface-Enhanced Raman Scattering: Physics and Applications (Topics in Applied Physics, Vol. 103) (Springer, Berlin, 2006), pp. 1; K. A. Willets and R. P. Van Duyne, Ann. Rev. Phys. Chem. 58, 267 (2007).
2. Schatz, G. C., Acct. Chem. Res. 17, 370 (1984).
3. Schatz, G. C., Y. M., , and Duyne, R. P. Van, in Surface-Enhanced Raman Scattering: Physics and Applications (2006), Vol. 103, pp. 19.
4. Kerker, M., Wang, D. S., and Chew, H., Appl. Opt. 19, 4159 (1980).
5. Bohren, C. F. and Huffman, D. R., Absorption and Scattering of Light by Small Particles. (Wiley-VCH, 2004).
6. Qin, L. D., Zou, S. L., Xue, C., Atkinson, A., Schatz, G. C., and Mirkin, C. A., Proc. Nat. Acad. Sci. 103, 13300 (2006).
7. Kneipp, K., Kneipp, H., and Kneipp, J., Acct. Chem. Res. 39, 443 (2006).
8. Qin, L. D., Park, S., Huang, L., and Mirkin, C. A., Science 309, 113 (2005).
9. Hagness, S. and Taflove, A., Computational Electrodynamics: The Finite-Difference Time-Domian Methods. (Boston, 2005); J. J. Goodman, B. T. Draine, and P. J. Flatau, Opt. Lett. 16, 1198 (1991).
10. Barabasi, A. L. and Stanley, H. E., Fractal concepts in surface growth. (Cambridge University Press, 1995).
11. Li, S. and Schatz, G. C., (to be published).
12. Kelly, K. L., Coronado, E., Zhao, L. L., and Schatz, G. C., J. Phys. Chem. B 107, 668 (2003); J. J. Goodman, B. T. Draine, and P. J. Flatau, Opt. Lett. 16, 1198 (1991).
13. Draine, B. T., User Guide to the Discrete Dipole Approximation Code DDSCAT6.1. (2004).
14. Johnson, P. B. and Christy, R. W., Phys. Rev. 12, 4370 (1972).
15. Hao, E. and Schatz, G. C., J. Chem. Phys. 120, 357 (2004).

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed